<?php
/**
 * Simple file-based logger for WooList.
 *
 * Writes to wp-content/uploads/woolist-logs/woolist.log.
 * The directory is protected from direct HTTP access via .htaccess.
 *
 * Levels:
 *   INFO  — always written (subscription events, connection test results)
 *   ERROR — always written (API failures, config problems)
 *   DEBUG — written only when "Enable debug logging" is on (full request/response)
 *
 * @package WooList
 */

defined( 'ABSPATH' ) || exit;

class WooList_Logger {

	/** Absolute path to the log file. */
	private static string $log_file = '';

	/** Whether verbose debug lines are recorded. */
	private static bool $debug_enabled = false;

	/** Maximum log file size in bytes before rotation (1 MB). */
	private const MAX_SIZE = 1048576;

	/**
	 * Initialise the logger: create the log directory and read the debug setting.
	 * Must be called after WordPress options are available.
	 */
	public static function init(): void {
		$upload     = wp_upload_dir();
		$log_dir    = $upload['basedir'] . '/woolist-logs';

		if ( ! is_dir( $log_dir ) ) {
			wp_mkdir_p( $log_dir );
		}

		// Block direct HTTP access and directory listing.
		$htaccess = $log_dir . '/.htaccess';
		if ( ! file_exists( $htaccess ) ) {
			file_put_contents( $htaccess, "Require all denied\ndeny from all\n" );
		}
		$index = $log_dir . '/index.php';
		if ( ! file_exists( $index ) ) {
			file_put_contents( $index, "<?php // Silence is golden.\n" );
		}

		self::$log_file      = $log_dir . '/woolist.log';
		self::$debug_enabled = ( get_option( 'woolist_enable_debug_log' ) === 'yes' );
	}

	// ── Public logging methods ───────────────────────────────────────────────

	/** Always logged. Use for normal subscription / connection events. */
	public static function info( string $message ): void {
		self::write( 'INFO', $message );
	}

	/** Always logged. Also echoes to php error_log as a fallback. */
	public static function error( string $message ): void {
		self::write( 'ERROR', $message );
		error_log( '[WooList ERROR] ' . $message );
	}

	/**
	 * Logged only when debug mode is enabled.
	 * Use for full request URLs, raw response bodies, step-by-step flow.
	 */
	public static function debug( string $message ): void {
		if ( self::$debug_enabled ) {
			self::write( 'DEBUG', $message );
		}
	}

	// ── Utility ─────────────────────────────────────────────────────────────

	/**
	 * Strip the password parameter from a phpList URL before logging it.
	 *
	 * @param string $url Full API URL.
	 * @return string URL with password value replaced by ***.
	 */
	public static function redact_url( string $url ): string {
		return preg_replace( '/(\bpassword=)[^&]+/', '$1***', $url );
	}

	/**
	 * Return the last $lines lines of the log as a string.
	 *
	 * @param int $lines Number of lines to return.
	 * @return string Log tail, or an empty string when the log doesn't exist yet.
	 */
	public static function read_recent( int $lines = 300 ): string {
		if ( empty( self::$log_file ) || ! file_exists( self::$log_file ) ) {
			return '';
		}

		$content = file_get_contents( self::$log_file );
		if ( $content === false || $content === '' ) {
			return '';
		}

		$all    = explode( "\n", rtrim( $content ) );
		$recent = array_slice( $all, -$lines );
		return implode( "\n", $recent );
	}

	/** Truncate the log file without deleting it. */
	public static function clear(): void {
		if ( ! empty( self::$log_file ) ) {
			file_put_contents( self::$log_file, '' );
		}
	}

	public static function get_log_path(): string {
		return self::$log_file;
	}

	public static function is_debug_enabled(): bool {
		return self::$debug_enabled;
	}

	// ── Internal ─────────────────────────────────────────────────────────────

	private static function write( string $level, string $message ): void {
		if ( empty( self::$log_file ) ) {
			return;
		}

		// Rotate if the file exceeds MAX_SIZE.
		if ( file_exists( self::$log_file ) && filesize( self::$log_file ) >= self::MAX_SIZE ) {
			rename( self::$log_file, self::$log_file . '.old' );
		}

		$line = '[' . gmdate( 'Y-m-d H:i:s' ) . ' UTC] [' . $level . '] ' . $message . "\n";
		file_put_contents( self::$log_file, $line, FILE_APPEND | LOCK_EX );
	}
}